utils.c: Fix ast_set_default_eid for multiple platforms

ast_set_default_eid was searching for ethX, emX, enoX, ensX and even
pciD#U interface names.  While this was a good attempt, it wasn't
inclusive enough to capture interfaces like enp6s0 or ens6d1, etc.

Rather than relying on interface names, we now simply find the first
interface returned by the OS that has a hardware address and that
address isn't all 0x00 or all 0xff.  The code IS different for BSD,
Solaris and Linux based on what method is available for enumerating
interfaces.

Tested on:
FreeBSD9
CentOS6
Ubuntu14
Fedora24

I was unable to test on Solaris at this time but the code for Solaris
is used elsewhere at Digium.

Change-Id: Iaa6db87ca78a9a375e47d70e043ae08c1448cb72

1 files changed, 199 insertions, 45 deletions

diff --git a/main/utils.c b/main/utils.c
index af0ee7f6b..03bead273 100644
--- a/main/utils.c
+++ b/main/utils.c
@@ -2478,72 +2478,226 @@ char *ast_eid_to_str(char *s, int maxlen, struct ast_eid *eid)
 	return os;
 }
 
+#if defined(__OpenBSD__) || defined(__NetBSD__) || defined(__FreeBSD__) || defined(__Darwin__)
+#include <ifaddrs.h>
+#include <net/if_dl.h>
+
 void ast_set_default_eid(struct ast_eid *eid)
 {
-#if defined(SIOCGIFHWADDR) && defined(HAVE_STRUCT_IFREQ_IFR_IFRU_IFRU_HWADDR)
-	int s, x = 0;
+	struct ifaddrs *ifap, *ifaphead;
+	int rtnerr;
+	const struct sockaddr_dl *sdl;
+	int alen;
+	caddr_t ap;
 	char eid_str[20];
-	struct ifreq ifr;
-	static const unsigned int MAXIF = 10;
+	unsigned char empty_mac[6] = {0, 0, 0, 0, 0, 0};
+	unsigned char full_mac[6]  = {0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF};
 
-	s = socket(AF_INET, SOCK_STREAM, 0);
-	if (s < 0) {
+	rtnerr = getifaddrs(&ifaphead);
+	if (rtnerr) {
+		ast_log(LOG_WARNING, "No ethernet interface found for seeding global EID. "
+			"You will have to set it manually.\n");
 		return;
 	}
-	for (x = 0; x < MAXIF; x++) {
-		static const char *prefixes[] = { "eth", "em", "eno", "ens" };
-		unsigned int i;
 
-		for (i = 0; i < ARRAY_LEN(prefixes); i++) {
-			memset(&ifr, 0, sizeof(ifr));
-			snprintf(ifr.ifr_name, sizeof(ifr.ifr_name), "%s%d", prefixes[i], x);
-			if (!ioctl(s, SIOCGIFHWADDR, &ifr)) {
-				break;
-			}
+	if (!ifaphead) {
+		ast_log(LOG_WARNING, "No ethernet interface found for seeding global EID. "
+			"You will have to set it manually.\n");
+		return;
+	}
+
+	for (ifap = ifaphead; ifap; ifap = ifap->ifa_next) {
+		if (ifap->ifa_addr->sa_family != AF_LINK) {
+			continue;
 		}
 
-		if (i == ARRAY_LEN(prefixes)) {
-			/* Try pciX#[1..N] */
-			for (i = 0; i < MAXIF; i++) {
-				memset(&ifr, 0, sizeof(ifr));
-				snprintf(ifr.ifr_name, sizeof(ifr.ifr_name), "pci%d#%u", x, i);
-				if (!ioctl(s, SIOCGIFHWADDR, &ifr)) {
-					break;
-				}
-			}
-			if (i == MAXIF) {
-				continue;
-			}
+		sdl = (const struct sockaddr_dl *) ifap->ifa_addr;
+		ap = ((caddr_t) ((sdl)->sdl_data + (sdl)->sdl_nlen));
+		alen = sdl->sdl_alen;
+		if (alen != 6 || !(memcmp(ap, &empty_mac, 6) && memcmp(ap, &full_mac, 6))) {
+			continue;
 		}
 
-		memcpy(eid, ((unsigned char *)&ifr.ifr_hwaddr) + 2, sizeof(*eid));
-		ast_debug(1, "Seeding global EID '%s' from '%s' using 'siocgifhwaddr'\n", ast_eid_to_str(eid_str, sizeof(eid_str), eid), ifr.ifr_name);
+		memcpy(eid, ap, sizeof(*eid));
+		ast_debug(1, "Seeding global EID '%s'\n",
+				ast_eid_to_str(eid_str, sizeof(eid_str), eid));
+		freeifaddrs(ifaphead);
+		return;
+	}
+
+	ast_log(LOG_WARNING, "No ethernet interface found for seeding global EID. "
+		"You will have to set it manually.\n");
+	freeifaddrs(ifaphead);
+
+	return;
+}
+
+#elif defined(SOLARIS)
+#include <sys/sockio.h>
+#include <net/if_arp.h>
+
+void ast_set_default_eid(struct ast_eid *eid)
+{
+	int s;
+	int x;
+	int res = 0;
+	struct lifreq *ifr = NULL;
+	struct lifnum ifn;
+	struct lifconf ifc;
+	struct arpreq ar;
+	struct sockaddr_in *sa, *sa2;
+	char *buf = NULL;
+	char eid_str[20];
+	int bufsz;
+	unsigned char empty_mac[6] = {0, 0, 0, 0, 0, 0};
+	unsigned char full_mac[6]  = {0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF};
+
+	s = socket(AF_INET, SOCK_STREAM, 0);
+	if (s <= 0) {
+		ast_log(LOG_WARNING, "Unable to open a socket for seeding global EID. "
+			" You will have to set it manually.\n");
+		return;
+	}
+
+	/* Get a count of interfaces on the machine */
+	ifn.lifn_family = AF_UNSPEC;
+	ifn.lifn_flags = 0;
+	ifn.lifn_count = 0;
+	if (ioctl(s, SIOCGLIFNUM, &ifn) < 0) {
+		ast_log(LOG_WARNING, "No ethernet interface found for seeding global EID. "
+			" You will have to set it manually.\n");
 		close(s);
 		return;
 	}
+
+	bufsz = ifn.lifn_count * sizeof(struct lifreq);
+	if (!(buf = ast_malloc(bufsz))) {
+		ast_log(LOG_WARNING, "Unable to allocate memory for seeding global EID. "
+			"You will have to set it manually.\n");
+		close(s);
+		return;
+	}
+	memset(buf, 0, bufsz);
+
+	/* Get a list of interfaces on the machine */
+	ifc.lifc_len = bufsz;
+	ifc.lifc_buf = buf;
+	ifc.lifc_family = AF_UNSPEC;
+	ifc.lifc_flags = 0;
+	if (ioctl(s, SIOCGLIFCONF, &ifc) < 0) {
+		ast_log(LOG_WARNING, "No ethernet interface found for seeding global EID. "
+			"You will have to set it manually.\n");
+		ast_free(buf);
+		close(s);
+		return;
+	}
+
+	for (ifr = (struct lifreq *)buf, x = 0; x < ifn.lifn_count; ifr++, x++) {
+		unsigned char *p;
+
+		sa = (struct sockaddr_in *)&(ifr->lifr_addr);
+		sa2 = (struct sockaddr_in *)&(ar.arp_pa);
+		*sa2 = *sa;
+
+		if(ioctl(s, SIOCGARP, &ar) >= 0) {
+			p = (unsigned char *)&(ar.arp_ha.sa_data);
+			if (!(memcmp(p, &empty_mac, 6) && memcmp(p, &full_mac, 6))) {
+				continue;
+			}
+
+			memcpy(eid, p, sizeof(*eid));
+			ast_debug(1, "Seeding global EID '%s'\n",
+				ast_eid_to_str(eid_str, sizeof(eid_str), eid));
+			ast_free(buf);
+			close(s);
+			return;
+		}
+	}
+
+	ast_log(LOG_WARNING, "No ethernet interface found for seeding global EID. "
+		"You will have to set it manually.\n");
+	ast_free(buf);
 	close(s);
+
+	return;
+}
+
 #else
-#if defined(ifa_broadaddr) && !defined(SOLARIS)
+void ast_set_default_eid(struct ast_eid *eid)
+{
+	int s;
+	int i;
+	struct ifreq *ifr;
+	struct ifreq *ifrp;
+	struct ifconf ifc;
+	char *buf = NULL;
 	char eid_str[20];
-	struct ifaddrs *ifap;
-
-	if (getifaddrs(&ifap) == 0) {
-		struct ifaddrs *p;
-		for (p = ifap; p; p = p->ifa_next) {
-			if ((p->ifa_addr->sa_family == AF_LINK) && !(p->ifa_flags & IFF_LOOPBACK) && (p->ifa_flags & IFF_RUNNING)) {
-				struct sockaddr_dl* sdp = (struct sockaddr_dl*) p->ifa_addr;
-				memcpy(&(eid->eid), sdp->sdl_data + sdp->sdl_nlen, 6);
-				ast_debug(1, "Seeding global EID '%s' from '%s' using 'getifaddrs'\n", ast_eid_to_str(eid_str, sizeof(eid_str), eid), p->ifa_name);
-				freeifaddrs(ifap);
-				return;
+	int bufsz, num_interfaces;
+	unsigned char empty_mac[6] = {0, 0, 0, 0, 0, 0};
+	unsigned char full_mac[6]  = {0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF};
+
+	s = socket(AF_INET, SOCK_STREAM, 0);
+	if (s <= 0) {
+		ast_log(LOG_WARNING, "Unable to open socket for seeding global EID. "
+			"You will have to set it manually.\n");
+		return;
+	}
+
+	ifc.ifc_len = 0;
+	ifc.ifc_buf = NULL;
+	if (ioctl(s, SIOCGIFCONF, &ifc) || ifc.ifc_len <= 0) {
+		ast_log(LOG_WARNING, "No ethernet interface found for seeding global EID. "
+			"You will have to set it manually.\n");
+		close(s);
+		return;
+	}
+	bufsz = ifc.ifc_len;
+
+	if (!(buf = ast_malloc(bufsz))) {
+		ast_log(LOG_WARNING, "Unable to allocate memory for seeding global EID. "
+			"You will have to set it manually.\n");
+		close(s);
+		return;
+	}
+
+	ifc.ifc_buf = buf;
+	if (ioctl(s, SIOCGIFCONF, &ifc) < 0) {
+		ast_log(LOG_WARNING, "Unable to retrieve ethernet interfaces for seeding global EID. "
+			"You will have to set it manually.\n");
+		ast_free(buf);
+		close(s);
+		return;
+	}
+
+	ifrp = ifc.ifc_req;
+	num_interfaces = ifc.ifc_len / sizeof(*ifr);
+
+	for (i = 0; i < num_interfaces; i++) {
+		ifr = &ifrp[i];
+		if (!ioctl(s, SIOCGIFHWADDR, ifr)) {
+			unsigned char *hwaddr = (unsigned char *) ifr->ifr_hwaddr.sa_data;
+
+			if (!(memcmp(hwaddr, &empty_mac, 6) && memcmp(hwaddr, &full_mac, 6))) {
+				continue;
 			}
+
+			memcpy(eid, hwaddr, sizeof(*eid));
+			ast_debug(1, "Seeding global EID '%s' from '%s' using 'siocgifhwaddr'\n",
+				ast_eid_to_str(eid_str, sizeof(eid_str), eid), ifr->ifr_name);
+			ast_free(buf);
+			close(s);
+			return;
 		}
-		freeifaddrs(ifap);
 	}
-#endif
-#endif
-	ast_log(LOG_WARNING, "No ethernet interface found for seeding global EID. You will have to set it manually.\n");
+
+	ast_log(LOG_WARNING, "No ethernet interface found for seeding global EID. "
+		"You will have to set it manually.\n");
+	ast_free(buf);
+	close(s);
+
+	return;
 }
+#endif /* LINUX */
 
 int ast_str_to_eid(struct ast_eid *eid, const char *s)
 {